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An improved TCF sequence for biobleaching kenaf pulp: influence of the hexenuronic acid content and the use of xylanase
Andreu Terrén, Glòria; Vidal Lluciá, Teresa
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. Departament d'Enginyeria Tèxtil i Paperera; Universitat Politècnica de Catalunya. CELBIOTECH - Grup de Recerca: Enginyeria i Biotecnologia de Materials Lignocel·lulòsics
Enzymatic delignification with laccase from Trametes villosa used in combination with chemical mediators (acetosyringone, acetovanillone and 1-hydroxybenzotriazole) to improve the totally chlorine-free (TCF) bleaching of kenaf pulp was studied. The best final pulp properties were obtained by using an L-HBT-QPo sequence developed by incorporating a laccase-mediator stage into an industrial bleaching sequence involving chelation and peroxide stages. The new sequence resulted in increased kenaf pulp delignification (90.4%) and brightness (77.2%ISO) relative to a conventional TCF chemical sequence (74.5% delignification and 74.5% brightness). Also, the sequence provided bleached kenaf fibers with high cellulose content (pulp viscosity of 890 g . mL (1) vs 660 g . mL (1)). Scanning electron micrographs revealed that xylanase altered fiber surfaces and facilitated reagent access as a result. However, the LHBTX (xylanase) stage removed 21% of hexenuronic acids in kenaf pulp. These recalcitrant compounds spent additional bleaching reagents and affected pulp properties after peroxide stage. (C) 2013 Elsevier Ltd. All rights reserved.
Àrees temàtiques de la UPC::Enginyeria paperera::Pasta paperera::Blanqueig de pastes
Àrees temàtiques de la UPC::Enginyeria paperera::Primeres matèries papereres::Fustes papereres
Wood-pulp--Bleaching
Kenaf--Technological innovation
Xylanases--Industrial applications
Kraft pulping
Kenaf
TCF bleaching sequence
Laccase-mediator system (LMS)
Hexenuronic acids
Xylanase
NATURAL MEDIATOR SYSTEMS
KRAFT PULPS
CHEMICAL PULPS
IMPACT
ECF
Kenak, fibra de -- Blanqueig
Paper -- Blanqueig
Pasta de paper -- Blanqueig
info:eu-repo/semantics/publishedVersion
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